Kerberos
How can I get UrlToPdf working with Kerberos authentication?
Please try setting a Username and Password in the rendering settings:
https://ironpdf.com/object-reference/api/IronPdf.ChromeHttpLoginCredentials.html
We advise the use of System.Net.HttpClient to download HTML and then render it afterwards.
Here is an online guide on downloading pages with Kerberos: https://stackoverflow.com/questions/56182076/how-does-the-system-net-http-httpclient-select-authentication-type
You can use HTML Agility Pack to parse any HTML and ensure all the necessary assets are downloaded.